Check out this article about a teacher who calls a student a "loser".  When confronted for it he said he is just trying to relate to the students using their language.  I could think of a better way.  I agree with the mother...this teacher should be taught a lesson himself in humility.

http://www.aolnews.com/nation/article/teacher-rex-roland-writes-loser-on-students-assignment/19398466?icid=main|hp-desktop|dl1|link3|http%3A%2F%2Fwww.aolnews.com%2Fnation%2Farticle%2Fteacher-rex-roland-writes-loser-on-students-assignment%2F19398466